It was with the advent of the space era, and specifically the launch of the SOHO satellite 20 years ago, that the influence of solar activity on modern networks and equipment fully emerged. Its effects, varying from a momentary inconvenience to an enduring loss of systems in extreme cases, can be felt on entire sectors of activity in our societies.Astronomers, satellite operators, navigation systems specialists, service providers of space weather and civil aviation authorities will present in an educational way, accessible to non-specialists, the most recent knowledge as well as the initiatives on research, observation, forecast and protection.